[bisq-network/bisq] Adapt update popup (#2689)

[Christoph Atteneder]

I adapted the styling based on #2337.
![Bildschirmfoto 2019-04-10 um 16 34 04](https://user-images.githubusercontent.com/170962/55887841-92646180-5bae-11e9-8b7c-35a31dcb83bd.png)
But maybe id doesn't feel that aggressive and still hides the background better if we use following darkening.
![Bildschirmfoto 2019-04-10 um 16 34 41](https://user-images.githubusercontent.com/170962/55887843-92646180-5bae-11e9-934f-adbf9fdf80e0.png)


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